Sound sensors detect acoustic sound or noise of the environment. It can be used in intrusion detection system, home automation and many more.
This is a basic sound sensor board. It detects the presence or absence of sound but it can't identify the frequency and the loudness of it. The sensor itself is an electret microphone that works based on sound vibration principle.
The board has a LM393 voltage comparator chip to give out digital output and a potentiometer for sensor sensitivity adjustment. The working voltage of this module is between 3.3V and 5V. There are three pins for output marked as VCC, Ground and DO.
The DO pin gives digital output and you can read it easily with any microcontroller/microprocessor. When the sensor detects sound which is greater than the threshold, it gives output LOW. When no sound detected, it gives output HIGH.
There are 2 status indicator LEDs on board. The red one is to tell us the power is connected and the green one is for the status of sound detection. There is also a mounting hole on the PCB so that you can fix the position of this module.
Technical details:
Operating voltage: 3.3V - 5V
Red LED - operational status indicator
Green LED - output status indicator
Green LED ON, output LOW - sound detected
Green LED OF, output HIGH - no sound detected
A potentiometer that can be used to adjust sensitivity
